This is one part of the whole deal (and I'm leaving the whole Gap View discussion here for a bit) where I'm not 100% sold on.
Showing.
I'm not convinced that showing (ring or field) is absolutely necessary. If the Mom and Pop have all the proper clearances, and there is good history behind them, then I'm not so sure I care about the show thing at all.
Rusty was a farm dog. Nikita was a Pet Shop dog (before I knew better). Comet was from field lines, and came from Gap View in 1996. Dakota was a BYB dog that I traded a guitar amplifier for.
Speaking strictly on temperament, all of them were exceptionally well-rounded, wonderful dogs except possibly Nikita. She was good, but could be a bit of a bitch if she wanted to be
Of my current two:
Gilmour - Gilmour is as pure and properly bred as any Golden can possibly be. He comes from Pebwin and Lycinnan lines. He was bred by a breeder that has over 40 years experience, and is also an AKC Judge. In just his 5 generation pedigree, he has over
forty-three champions and multi-champions, which includes the famous Mulder (Pebwin-XPDNC is his grandfather).
Gilmour is a wonderful dog. I really could not ask for anything more. He is a smaller golden, on the lower end of the proper weight range (65 pounds of pure muscle), but I actually adore him for that. He has a cute factor of 10

He meets the proper Golden specs in all respects.
But if I'm being honest, I also have to say he is an exceptionally high energy Golden. He can also be hard headed

Some may call him a bit high-strung, but I don't like that term because his temperament is perfect. He's simply a power-packed pooch LOL I would not change a thing about him, but it also would not bother me if he mellowed a bit as he aged.
Milo - The classic BYB dog. Re-homed to me at 8 months by a family expecting a baby. Parents cleared, but no show/field trial history at all that I know of. He is of the field variety. He is such a big, lovable goofball everyone he meets just adores him. He lives for his toys. He has to bring one to bed with him every night. If the one he wants is 2 feet away, he still hops and pounces on it like a bunny rabbit

He is absolutely stuffed full of character.
And he also has the ability to take everything Gilmour can dish out play wise, which is a
ton, and hand it right back.
So, is Show/Field Trials important to a dog's temperament? I still don't know. To be honest, the personal experience I have shows just the opposite.
And I also have to say that the most loving, goofy, wonderful-temperament Goldens I've met have all been of the field variety. But I also have to say that of the very few 'mean' Golden's I've ever met, the nastiest of the bunch were also field Golden's. I have no idea what the hell that means
None of the dogs they use for breeding are shown, so add possible training issues (if the parents aren't trained and/or socialized, they don't need to have good temperments, and if they don't have them they can't pass them on)